Exclude Dagger local snapshots from Maven local repo cache.

This prevents the LOCAL-SNAPSHOT artifacts from being cached with the rest of the `.m2/repository` directory which in turn would cause other jobs to fail due to not using the local snapshots built for the workflow. Instead use the upload and download actions to share the artifacts between jobs.

RELNOTES=N/A
PiperOrigin-RevId: 354200073

.github/workflows/ci.yml

@@ -16,7 +16,9 @@ jobs:
       - name: 'Cache local Maven repository'
         uses: actions/cache@v2
         with:
-          path: ~/.m2/repository
+          path: |
+            ~/.m2/repository
+            !~/.m2/repository/com/google/dagger
           key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
           restore-keys: |
             ${{ runner.os }}-maven-
@@ -26,20 +28,23 @@ jobs:
       - name: 'Install local snapshot'
         run: ./util/install-local-snapshot.sh
         shell: bash
+      - name: 'Upload local snapshot for tests'
+        uses: actions/upload-artifact@v2
+        with:
+          name: local-snapshot
+          path: ~/.m2/repository/com/google/dagger
   artifact-local-tests:
     name: 'Artifact local tests'
     needs: bazel-test
     runs-on: ubuntu-latest
     steps:
     - name: 'Check out repository'
       uses: actions/checkout@v2
-    - name: 'Cache local Maven repository'
-      uses: actions/cache@v2
+    - name: 'Download local snapshot for tests'
+      uses: actions/download-artifact@v2
       with:
-        path: ~/.m2/repository
-        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-        restore-keys: |
-          ${{ runner.os }}-maven-
+        name: local-snapshot
+        path: ~/.m2/repository/com/google/dagger
     - name: 'Gradle tests'
       run: ./util/run-local-gradle-tests.sh
       shell: bash
@@ -53,13 +58,11 @@ jobs:
     steps:
       - name: 'Check out repository'
         uses: actions/checkout@v2
-      - name: 'Cache local Maven repository'
-        uses: actions/cache@v2
+      - name: 'Download local snapshot for tests'
+        uses: actions/download-artifact@v2
         with:
-          path: ~/.m2/repository
-          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-          restore-keys: |
-            ${{ runner.os }}-maven-
+          name: local-snapshot
+          path: ~/.m2/repository/com/google/dagger
       - name: 'Gradle Android tests (AGP ${{ matrix.agp }})'
         run: ./util/run-local-gradle-android-tests.sh "${{ matrix.agp }}"
         shell: bash